<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>自定义Toast，类似于android的Toast</title>
<style>
body {
 
}

</style>
<script>
//自定义弹框
    function Toast(msg,duration){
        duration=isNaN(duration)?3000:duration;
        var m = document.createElement('div');
        m.innerHTML = msg;
        m.style.cssText="width: 60%;min-width: 150px;opacity: 0.7;height: 30px;color: rgb(255, 255, 255);line-height: 30px;text-align: center;border-radius: 5px;position: fixed;top: 40%;left: 20%;z-index: 999999;background: rgb(0, 0, 0);font-size: 12px;";
        document.body.appendChild(m);
        setTimeout(function() {
            var d = 0.5;
            m.style.webkitTransition = '-webkit-transform ' + d + 's ease-in, opacity ' + d + 's ease-in';
            m.style.opacity = '0';
            setTimeout(function() { document.body.removeChild(m) }, d * 1000);
        }, duration);
    }
</script> 
</head>
<body>
<button onclick="Toast('不能购买自己的商品',2000);">Toast</button>
</body>
</html>